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rc/sh/unwrap

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#!/usr/bin/env sh
# compat: +ash +bash +dash +hush +ksh +mksh +oksh +osh +posh +yash +zsh
unwrap() { ### @- join paragraphs into one line each.
awk 'BEGIN{RS="\n\n";FS="\n"}{for(i=1;i<=NF;i++)printf "%s ",$i;print "\n"}'
}
[ -n "${preload+-}" ] || unwrap "$@"